A218353 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 nX7 array.

57, 7361, 757305, 78394141, 8199377227, 856149291505, 89373230342147, 9330728065217697, 974144457139164177, 101701766819321353361, 10617786795585969799967, 1108509971334366966147185

Offset: 1

Author

R. H. Hardin Oct 26 2012

Keywords

• nonn

Comments

Column 7 of A218354

Examples

			Some solutions for n=3
..0..1..1..0..0..1..0....0..1..0..1..0..0..1....0..1..1..1..1..1..0
..0..0..0..1..1..0..1....0..0..0..1..1..0..1....0..1..1..1..0..0..1
..1..1..0..0..0..1..1....1..1..1..1..0..1..1....0..1..0..1..0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..34